Edge finishing strip for plaster walls



Oct.d 4, 1949. G. R. DANlELsoN 2,483,888

EDGE FINISHING STRIP FOR PLASTER WALLS Filed Aug. s, 1944 Patented Oct.4, 1949 Gdeonlt; Danielson, Geneva,-

Y Appuceuoneugusf 3, 1944, serial Nutmss (Cl, '12e-0.51)

31Cl'aims. l

MS* invention4 relatesv to` an improved edge finishingstrip` for plasterwalls; and more particularly' to one providedY with a plasterlockarranged in a. marmer so aste prevent checking or the development 01hairline cracks at the exposed cornerformed by' an edge of a plasterwall surface:

TheY object' of the edgenislling strip herein shownis to provide ait'points, where it is necessary tor terminate a plaster' wall surface; anedge surface of ar protective material, such as metal or plastic. Forinstance, where' tlie edge surface of a plaster wall wouldv be expcsedjto impact which wouldy tend to chip ofithe exposed corner or crackr theplaster edge surface til-ieVA use or am edgel rrsliing strip would serveto prevent: andwould also be of decorative value:

In other instances where a plastered wall surface would ordinariiydirectly abutk an object, such as a built-in bathstub, undercircumstances which would permit a crack to open up* such joint, Fha-vefound it advisable toterminate the wall surface sl-io'rt of the' objectby' an edge 'nis'hing stripe so that the1 joint will be lie-tween` theprotective material of the finishing stri'pand the object; instead? ofbetween the plaster' itself and the object.. Tlii-s is: or especialadvantage. in situations where.Y plaster joiiitwould' be exposed tomoistute thev` reason that water. working into atplaster joint willtendto disintegratetlaet plaster from beneath. the: surface;y therebyeventually causing the. chipping off ofthe4 plaster atA the joint;resultingirn arr eizilarged'r irregular and unsightllycraclt.

Myinvention overcomes this` diiilcu'lty in two respects: First, byprovidingv a, moisture imperclous edge the water cannot get up into theplaster from. the joint; and secondly,l by proriding a plaster lockwhich extends inwardly trom the corner not only is the corner protectedfrom accidental blows. or impact, but the plas-ter is aise reinforced soas to prevent the development of cracks. extending inwardly from: thewally sur; face.

A further obiect of' my invention is; to provide a. finishing stripwhich is of decorative value: and which cari serve as a; plaster:lground in the securng of a. subst'ani-:iallyr plane wall:- surfaceadjacent the -nishect edge.

Another obiects toprovide an, improvcdmeens 2 for protecting the plasterwall at points where it abuts ari object' such as a built-in bath-tub;

Stil-l another objiect; is to provide an` improved joint between theplaster wal-ll and the bath-tub which isi substantially resistant to thedisintegrate ing action of-'the Water;

A stili further' oliject is to provide a -n-islii-ng stripisu'itable foruse at the joints betweenI plaster Walls and plumbing fixtures whichembodies Hreai'rsfY whichY tendto preventr theb entry of water intervthe crack' between the finishingstrip'Y and the plumbing fixture.

Still another object is.V to pro-vide improved means' for finishing ofithe edge of a plaster: wall sua-face a manner which willfprotect andrei-nforce the, plaster wall surface the vicinity` of the exposedcorner.

@ther otrie'ctsl,v features and advantages of my invention willL becomeapparent as this` description proceeds. A

Witt reference now to the dra/Wingsihwhich like referencel numeralsdesignate like parts,

' Fig. I is ai perspectveview of a prefer-red embadi-ment myinvention;

l'fg. Z isalseotionv through the-joint-between the plastered wallsurface and a; bath-tub-whi'ch illustrates: one applicationof thefinishing strip shown irs-Fig. I;

Fig: :iis asecti'on` similar to Fig-1 2,I butshowing a;- modiedi form otfinish-ing strip;-

Fig. 4 is a. perspective View of tliemodied form oflnisliingfstrip shownirrlii'g. 3;

Fig. 5 is afvi'ewsimi-lfa'fr to Fg; 2' but showing a: still? furthermodified fori-n1 of the nishing strip.;

Figsv 6V arid'f'? are sections showing other applications of theiinisliing'stripslnown-v inFig. I; and

Fig... 8 is atsection showing. a modi'fedform of imzenti'on.VrefferenfcenowtoFigs. l and 2, the reference numeral Hl' designatesgenerally a riishing strip which. preferably is formed from a strip ofmetai and folded alonglines ll" and lf2 into the form shown.. folded thefinishing strip comprises: a. verticalE portion i3, a, horizontallyextelidingrportion adjacent thereto, and referred to hereinafter as theedge t4, and a rearwardly and opwavdty bent. portion which ishereinafter reterreur toas the plasterlfock l5. The plaster lock isformed with a series of apertures I6 therein A. tlzmough the plaster ofa walt surface may be forced in order to reinforce the plaster in thevicinity of the corner formed by the edge of the wall. These aperturesare shown as being of triangular shape, with the bases of the trianglesclosely adjacent the fold line I2.

The manner of application of the finishing strip I to a wall is shown inFig. 2 in which the reference numeral I8 designates generally a wall.The wall may be of the usual construction, including studding I9, lathnailed thereto, and one or more coatings of plaster applied thereto, theplaster being designated by the reference numeral 2 I'.

Between the studding there is secured a backing strip 22 to which thefinishing strip I0 is nailed by nails 23. The finishing strip isoriginally provided with nail holes I1 for this purpose, as shown inFig. 1.

1t will be noted from Fig. 2 that the crushing strip is nailed in placeprior to the application of the lowermost lath, the gap between the endof of my invention which is particularly adapted for use in providing awatertight joint with a baththe plaster lock I5 and the verticalportionI3 l being wide enough to receive the lath.

As the wall is plastered, the plaster is forced through the apertures I6in the plaster lock I5 so that the plaster is reinforced in the vicinityof the fold line I 2, otherwise referred to herein as the exposedcorner. Due to the fact that the edge I4 is substantially perpendicularto the direction of the pressure of the masons trowel, the finishingstrip can also be used as a ground or a bearing point for the trowel inorder to secure a substantially plane surface in the vicinity of thefinishing strip.

the plaster lock abuts the lath 29 which serves further to increase theresistance of the finishing strip to the pressure of the trowel.

Although the finishing stripA when installed as pointed out above can beused to finish off any edge of a plastered wall surface, such forinstance as the edge formed around doors and windows, Fig. 2 shows themanner in which the wall may be finished off at the point where theplaster would ordinarily abut a built-in bath-tub 24.

The built-in bath-tub 24 is shown as being provided with a flange whichin accordance with the usual practice has a slight downward slope and asmall upwardly projecting boss 2E at its edge. It has been found thatwithin the first year or so after the installation of a built-inbath-tub, there will be a certain amount of settling of the timbers onwhich the bath-tub is supported. Thus any plaster joint will crack open.Whereas the use of a finishing strip at the joint will not avoid thesettling or dispense with the crack, it does provide a crack which isnished looking and has smooth edges, and is not subject todisintegration by moisture. This is preferable to the irregular andconstantly enlarging crack which obtains where the finishing strip isnot used.

The crack between the finishing strip and the bath tub may be plugged,if desired, with a strip of rubber of circular cross-section of adiameter greater than the width of the crack. This rubber sealing strip21 when forced into the crack is sufficiently compressed so that aconsiderable amount of settling can subsequently take place withoutcausing the strip 21 to become loosened.

The plaster wall surface may be provided with a coating of waterproofenamel or paint, with the result that a waterproof and non-crackingjoint is provided which will permit of certain amount of settling.

In Figs. 3 and 4 I have shown a modified form It will also be noted thatthe inner portion of tub. In this modification the finishing strip 30comprises a vertical portion 3| and edge 32 and a plaster look 33,the'latter being provided with circular apertures 34. The lower part ofthe vertical portion 3I is bent forwardly at a slight angle, asindicated by the reference numeral 35, so that the fold line 36 isspaced from the backing strip 22. The finishing strip 30 is formed froma much wider strip of metal than the finishing strip I0, and the excessmetal is accommodated by providing a folded over portion 31 whichextends downwardly from a fold line 38, and which at its lower portionis curved as indicated at 39. The folded over portion 31 terminates in aforwardly projecting portion which is referred to herein as a sealingstrip 48.

Reference to Fig. 3 shows that the space behind the bent portionaccommodates the curved portion 39, and the resilience of the foldedover portion 31 causes thesealing strip 40 to be urged against theflange 25 of the bath tub 24.

. The finishing strip 30 is provided with nail holes 4 I, and is mountedon the wall in a manner similar to finishing strip I0; that is, it isnailed to the backing 22' by means of nails 23. This is preferablyaccomplished after the bath tub has been set in place, this finishingstrip 3i) being pushed downwardly against the resilience of the foldedover portion 31 so that it contacts the fold line 35 which acts as abearing point to insure a good pressure between the sealing strip andthe flange 25'. After the bath-tub 24' settles, the resilience of thefolded over portion 31 will cause the sealing strip 40 to remain incontact with the flange 25 so as to prevent the entry of water betweenthe two.

The finishing strip 30 is preferably made of a strip of comparativelythin gauge corrosion resisting metal having good spring properties suchas a nickel chromium steel alloy.

A still further modification is shown in Fig. 5 in which the finishingstrip 42 is a composite strip made up of two members 43 and 44.v Themember 43l includes the vertical portion 41 and the edge 48, and themember 44 includes the plaster lock 45 and a depending portion 45 whichpartially closes the gap between the edge 48 and the bathtub flange 25".i

The two members 43 and 44 may preferably be welded together as indicatedat 49. One advantage of this construction is that although both of themembers 43 and 44 are made of f' suitable non-rusting metal, the member43 may be of a less costly metal, and the member 44 may be provided withan ornamental plating which serves as a border around the bathtub.Although a crack will open up between the depending portion 46 and thebathtub flange 25 as the latter settles, it will be seen that thedepending portion will still serve as a partial barrier to the entry ofwater in any great amounts into the space between the edge 48 and theflange 25". If 'any water does enter into this space, it will be drainedback into the bathtub. This space is suiiiciently large so that therewill be no capillary effect which tends to retain the water.Furthermore, water splashed on the plaster wall surface 2!" as it runsdown to the bathtub, will not work into the crack due to the presence ofthe depending portion 46 which carries the water well below the lowersurface of the edge 48.

Although my invention has been shown as 76 being applied to a plasterwall embodying wooden laths, it will be understood that the inventionmay be applied to a wall embodying metal laths as Well.

I have found it preferable to employ a plaster lock such as that shownin Fig. 1; namely, one wherein the apertures are triangularly shapedwith their bases parallel to the line of intersection of the diagonallydisposed portion I 5 and the edge portion I4. For instance, this spacingcan be one-eighth of an inch orless for best results.

Fig. 6 is a horizontal section, the central portion being broken,through a wall 59 at a doorway or other opening, and illustrates anotherapplication of the finishing strip shown in Fig. 1. In this instance,two finishing strips 5l and 52 are nailed to the studding 53 or othersupport which forms one edge of a doorway. The plaster is designated bythe reference numerals 54 and 55, and is applied to laths 56 and 51nailed to the studding 53.

Fig. 7 is a vertical section through a wall showing a still furtherapplication of the finishingV strip of Fig. 1 in connection with abaseboard 58. A finishing strip 59 is mounted just above' the baseboard58 and is nailed to a backing strip 60. The advantages of thisconstruction are that the plaster 6i is flush with the baseboard, anddue to the non-overlapping construction, a considerable amount ofplaster is saved.

Fig. 8 is a horizontal section through a wall at a point Where a door orwindow casing Sla is inserted in the wall. The casing 6I includes aframe member 62 which is shown as being set beneath the surface of theplaster 63. The finishing strip 64 is a modification of that shown inFig. 1 in that it is provided with an oifset portion 65, forming arecess in which the frame member 62 may be received. In both Figs. 6 and8, the exposed corners of the plaster are protected by a finishing stripwhich embodies a plaster lock.

Although I have shown only preferred embodiments of my invention, itwill be understood that various changes and modifications may be madetherein without departing from the spirit thereof. The foregoingdescription and the drawings are illustrative only, and my invention isto be limited only by the appended claims.

I claim:

1. An article of manufacture comprising a resilient metal strip foldedlongitudinally into four continuous longitudinal portions which areconnected to each other by folds along their side edges, each of saidfirst and second portions being substantially planar, the second andthird portions being disposed substantially perpendicular to each other,the first portion being disposed at an acute angle to said secondportion and extending toward said third portion, and being of a widthless than the width of said second portion, and said fourth portionbeing folded back over said third portion, and in contact therewith, andbeing of a Width greater than the width of said third portion, saidfourth portion being bent forwardly said fourth portion, therebypermitting said marginal portion to bear against a surface spaced fromand disposed substantially parallel to said second portion to form aseal. Y

2. An article of manufacture as set forth in claim 1, wherein the lowerpart of said third portion is bent forwardly to permit said fourthportion to assume a radius of curvature sufllciently great so that itwill not be iiexed beyond its elastic limit when it is flexed so thatsaid marginal part is closely spaced from the surface of said secondportion.

3. A sealing strip for sealing the joint between a plaster wallstructure and a bathtub ange comprising a single strip of resilientmetal folded longitudinally to provide three parallel folds, said striphaving rst, second, third and fourth continuous longitudinal portionsconnected to each other by said folds, said second portion beingsubstantially planar, said third portion extending from the fold alongone side of said second portion and being disposed substantiallyperpendicular to said second portion, said iirst portion extending fromthe fold on the opposite side of said second portion and extendingbackwardly toward said third portion, the marginal edge of said firstportion being spaced from said third portion, and said fourth portionextending from the fold of said third portion in a downward directionand being bent forwardly underneath said second portion, the bent partof said fourth portion being bent in a comparatively large radius andbeing adapted to resiliently bear against said bathtub flange to form aseal.

GIDEoN R. DANIELsoN.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,029,106 Collins June 11, 19121,624,121 'I'hiem Apr. 12, 1927 1,674,344 Richards June19, 19281,694,673 Thomas Dec. 11, 1928 1,723,991 Baum Aug. 13, 1929 1,765,712Baum June 24, 1930 1,924,971 Baum Aug. 29, 1933 1,939,115 Fritsche Dec.12, 1933 2,045,482 Maier June 23, 1936 2,143,034 Sakier Jan. 10, 19392,178,501 Stancampiano et al. Oct. 31, 1939 2,357,688 Robinson Sept. 5,1944 FOREIGN PATENTS Number Country Date 41,526 Norway 1925

